<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        function changeCode() {
            var imgObj = document.getElementById("codeImg");
            imgObj.src = "/checkCode?" + Math.random();
        };
    </script>
</head>
<body>
<form action="user/land" method="post">
    用户名：<input type="text" name="name"><br>
    密码：<input type="password" name="password"><br>
    <img src="/checkCode" id="codeImg"><a href="javascript:changeCode()">看不清楚，换一张</a><br>
    验证码：<input type="text" name="userCode"><br>
    <input type="submit" value="提交">
</form>
</body>
</html>